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10 cards from this deck
How linearly correlated two variables are
∑xi2−(∑xi)2n\sum x_i^2 - \frac{(\sum x_i)^2}{n}∑xi2−n(∑xi)2
∑yi2−(∑yi)2n\sum y_i^2 - \frac{(\sum y_i)^2}{n}∑yi2−n(∑yi)2
∑xiyi−∑xi∑yin\sum x_i y_i - \frac{\sum x_i \sum y_i}{n}∑xiyi−n∑xi∑yi
r=SxySxxSyyr = \frac{S_{xy}}{\sqrt{S_{xx}S_{yy}}}r=SxxSyySxy
Between -1 and 1
Perfect positive linear correlation
Perfect negative linear correlation
No linear correlation between xxx and yyy
No effect
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